A5032514340- Microstructure and Mechanical Properties of Steels
- Additive Manufacturing Materials and Processes
- Metal Alloys Wear and Properties
- Welding Techniques and Residual Stresses
- Microstructure and mechanical properties
- High Entropy Alloys Studies
- Metallurgy and Material Forming
- Hydrogen embrittlement and corrosion behaviors in metals
- Additive Manufacturing and 3D Printing Technologies
- Aluminum Alloys Composites Properties
- Aluminum Alloy Microstructure Properties
- High Temperature Alloys and Creep
- Titanium Alloys Microstructure and Properties
- Shape Memory Alloy Transformations
- Corrosion Behavior and Inhibition
- Metal and Thin Film Mechanics
- Advanced Welding Techniques Analysis
- Magnesium Alloys: Properties and Applications
- High-pressure geophysics and materials
- Magnetic Properties and Applications
- High-Temperature Coating Behaviors
- Metallurgical and Alloy Processes
- Advanced materials and composites
- Calcium Carbonate Crystallization and Inhibition
- Electrodeposition and Electroless Coatings
Dong-A University
2021-2025
Korea Institute of Industrial Technology
2015-2021
Korea Evaluation Institute of Industrial Technology
2018
Max Planck Society
2014-2015
Max-Planck-Institut für Nachhaltige Materialien
2014-2015
Pohang University of Science and Technology
2007-2015
Korea Post
2010
Molecular dynamics simulations are performed to investigate temperature- and stress-induced phase transformations in nanocrystalline nickel-titanium shape-memory alloys. Our results provide detailed insights into the origins of experimentally reported characteristics at nanoscale, such as decrease transformation temperature with grain size disappearance plateau stress-strain response. The relevant atomic scale processes, nucleation, growth, twinning analyzed explained. We suggest that a...
18Ni-300 maraging steel produced by the selective laser melting (SLM) process has a unique microstructure that is different from of same alloy processed conventional methods. In this paper, steels were fabricated and their microstructures mechanical properties investigated in terms post heat treatment conditions. Moreover, effect treatments on anisotropy was studied detail. The micro Vickers hardness as-built state around 340 Hv could be increased to approximately 600 aging treatments. It...
The phase transformation behavior from metastable bcc-δ to fcc-γ in Fe–Mn–Si based shape memory alloy processed by laser powder bed fusion was investigated. Primary δ formed this due the rapid cooling and fast solidification. Bcc-δ occurred when volumetric energy density high process-inherent heat treatment effect. Transmission electron microscope studies confirmed Kurdjumov-Sachs orientation relationship between phases. analytical results revealed that a combined displacive-diffusional mechanisms.
In recent years, the demand for high strength materials such as aerospace, offshore plant, energy, and manufacturing has increased due to need stability reliability in severe environments. Especially, Inconel 718, a nickel-based superalloy with excellent properties, is widely used. 718 undergoes two-step process, including solution heat treatment aging, control its mechanical properties. The alloy's relies on precipitation phases like MC carbides, Gamma prime (γ′), double (γ'´), influenced...
At very low temperatures, typically ductile materials, especially body-centered cubic (BCC) steels, often exhibit an abrupt transition to brittle fracture, significantly limiting their applicability in cryogenic and low-temperature environments. This challenge arises from the inherent properties of BCC where ductility is drastically reduced, leading unexpected failures under mechanical stress. Despite advantages high-strength including cost-effectiveness robustness, susceptibility fracture...
Ti-6Al-4V (Ti64) alloy is widely utilized in the aerospace industry due to its high strength, fatigue resistance, corrosion and cryogenic properties. However, raw material costs machining difficulties necessitate development of efficient manufacturing processes. This study evaluates mechanical reliability microstructure Ti64 components fabricated using wire laser additive (WLAM) subsequently joined via tungsten inert gas (TIG) welding. The WLAM process produces refined microstructures with...
The high-Mn austenitic steels exhibit fully structure at room temperatures while showing twinning mechanisms during deformations. In the SAW welding process, microstructure and mechanical properties of heat affected zone (HAZ) weld metal (WM) are by causing potential degradation due to segregation depletion Mn in HAZ WM regions. this study, post treatment (PWHT) was performed 800 °C, 900 °C 1000 improve welded steels. We examined electron backscattered diffraction (EBSD) energy dispersive...